Diaphragm type electromagnetic signal device



Nov. 1, 1949. P. c. RECK DIAPHRAGM TYPE ELECTROMAGNETIC SIGNAL DEVICEFiled Jan. 8, 1947 ai 6 28. 6% //7 yc-vvfor A Patented Nov. 1, 1949DIAPHRAGM TYPE ELECTROMAGNETIC SIGNAL DEVICE Peter 0.. Beck, Adrian,Mich., assignor, by mesne assignments, to ,Sperti Faraday Inc., acorporation of Ohio Application Januar 's, 1947, Serial No. 720,798

1 Claim. 1

This invention relates to vibratory diaphragm type" of electricsignalling means.

This invention has utility when incorporated in sound generating devicesof the electric horn type. The assembly is in a rugged compact unit witha yieldably mounted actuator in conjunction with an adjustable controltherefor.

Referring to the drawings:

Fig. 1 is a front view of the unit assembled in a projectorless horn;

Fig. 2 is an enlarged view of the horn of Fig. 1, from the back ormounting side thereof, a portion being broken away;

Fig. 3 is a still further enlarged view of a fraction of the unit fromthe left of Fig. 2;

Fig. 4 is a fragmentary view from the right of Fig. 3, showing theyieldable mounting for the coil and the adjustment for the spring tongueof the breaker switch;

Fig. 5 is a partial side elevation of the unit of Fig. 2, broken away toshow the circuit breaking switch in side elevation; and

Fig. 6 is a wiring diagram of the electric circuit for the unit.

The electric circuit Electric current supply lines I, 2, extend toterminal-s 3, 4, on a fiber insulator block 5. From the terminal 3, alead line 6 extends to a condenser I, and in parallel therewith is aconductor line 8 to a coil 9 having an electromagnet core III. From theterminal 4 a line II extends to a terminal I2 having an insulationmounting I3. From the mounting I3 is a stirrup I4 to a riser free end I5having an insulation assembly IS with an adjusting means H. Theintermediate drop portion of the stirrup I4 has a switch terminal I8normally in contact with a terminal I9 of a spring tongue 20 having aninsulation mounting 2 I.

The circuit from the terminal I 2, thru the stirrup I4 to the closedswitch I8," I 9, is to the tongue 20. Therefrom it is completed by a lin22 to the coil 9. In parallel with the coil 9 between the terminal 3 andthe tongue 20, is the condenser I having toward the terminal 3 the lineconnection 6 and toward the tongue 20 a line connection 23.

The enclosing mounting A resonance transmitting wall 24, in a building,vessel or plane, engaged by screws 25, may mount a support or flange 26having rivet connections 21 with a flare shell orhousing 28 terminatingin a ledge 29.

The yieldable mounting for the electromagnet Ears 33 are diametricallyopposed and inward from the flange 26, carry screws 3I to engageoutwardly extending springarms 32, assembled by a Mounting and enclosingthe diaphragm In lieu of a projector, a perforate shield 49 may havescrews 4I pass therethru to locate concentrically therein an insulationring 42 against a diaphragm disk 43. The screws M, in passing thru the.diaphragm 43, pull the edges of the diaphragm against the outer or rimportion of the base 31, to pack a felt or compressible packing 44against the ledge 29 as crowded theretoward by a flange 45 of the facingplate or shield 40. This provides a cushioning connection from themounting flange 26 in the reverse way thereto than from the arms 32.

The operation of the circuit breaking switch Centrally of the diaphragm43, there is an insulation disk 46 from which extends an armature orhammer action element 4! toward the fixed core II] in the coil 9. Whilethe core I0 is fixed with the coil 9, the whole electromagnet assemblybetween the arms 32 and the cushioning at the ledge 29, is a vibrationdampened mounting. As a switch 48 is closed to cut in an electriccurrent supply, the energized coil 9 overcomes the spring 20 to open thecircuit.

The energized coil 9 causes the magnet or core I9 to serve as anactuator for the armature 41, thereby to flex the diaphragm 43 asperipherally held. In this flexing, the insulation disk 46 rides againstthe free end of the leaf spring or tongue 20 to move it toward the coil9. This shifts the contact I9, fixed with the tongue 20, away from thecontact I8, fixed with the stirrup I4. The actuator operation is thusresisted, not only by the spring of the diaphragm 43, or the resiliencetherein, but by that of the tongue 29. The single end adjustment meansI! may so locate the terminal I9 again-st the supplementary contactterminal l9 that the opening of this normally-closed box cover plate, oreven against the inside wall of a submarine. The 725 cycle frequencydevelops sound values of 105 to 110 decibels at a distance of 3 ft.

In the general structure as disclosed, the current supply for energizingmay be either alternating or direct, and with the voltage even up to 120volts.

What is claimed and it is desired to secure by Letters Patent is:

An electric signal device adapted to be mounted on a resonant buildingstructure, said device comprising a support, a coil, a core for thecoil, a diaphragm, an armature mounted on the diaphragm, a housingextending from the support and about the coil and providing peripheralyieldablc con-' 4 nection for positioning the diaphragm with thearmature in normal spaced proximity from the core, a switch including acontact operated directly by the movement of the diaphragm-carriedarmature relatively to the coil, a frame mounting th switch independentof the diaphragm, yieldable arm means from the support, and meansanchoring the arm means, frame, coil and core as a unit sufilcientlyfixed to hold normal signal device movement relatively to the support.

PETER C. RECK.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS White Oct. 20. 1942

